<div class="image">
    <img src="../../static/img/sales/Redesign/home_page.jpg" alt="">
    <a class="join" href="/salemanintroduce.html"></a>
</div>

<style>
    .image{
        position: relative;
    }
    .image>img{
        /* 去掉底部的一点空白 */
        display: block;
    }
    .join{
        position: absolute;
        bottom: 30px;
        left: 50%;
        transform: translateX(-50%);
        width: 92%;
        height: 80px;               
    }
</style>